In an e-mail sent out to Play Store developers earlier, Google announced several updates to its developer program policy. The e-mail mentioned changes in policy including clarification to payment policy regarding subscription billing, the restriction of the "use of names or icons confusingly similar to existing system apps" (a statement that brings back memories of Facebook's "Messenger" gaffe), clarification regarding dangerous products, and practices that violate the Play Store's spam policy, all in addition to a stringent new Ad Policy.